1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <algorithm>
11
12 // template<ForwardIterator Iter, EquivalenceRelation<auto, Iter::value_type> Pred>
13 // requires CopyConstructible<Pred>
14 // constexpr Iter // constexpr after C++17
15 // adjacent_find(Iter first, Iter last, Pred pred);
16
17 #include <algorithm>
18 #include <functional>
19 #include <cassert>
20
21 #include "test_macros.h"
22 #include "test_iterators.h"
23
24
25 #if TEST_STD_VER > 17
eq(int a,int b)26 TEST_CONSTEXPR bool eq (int a, int b) { return a == b; }
27
test_constexpr()28 TEST_CONSTEXPR bool test_constexpr() {
29 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
30 int ib[] = {0, 1, 2, 7, 0, 1, 2, 3};
31
32 return (std::adjacent_find(std::begin(ia), std::end(ia), eq) == ia+2)
33 && (std::adjacent_find(std::begin(ib), std::end(ib), eq) == std::end(ib))
34 ;
35 }
36 #endif
37
main()38 int main()
39 {
40 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
41 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
42 assert(std::adjacent_find(forward_iterator<const int*>(ia),
43 forward_iterator<const int*>(ia + sa),
44 std::equal_to<int>()) ==
45 forward_iterator<const int*>(ia+2));
46 assert(std::adjacent_find(forward_iterator<const int*>(ia),
47 forward_iterator<const int*>(ia),
48 std::equal_to<int>()) ==
49 forward_iterator<const int*>(ia));
50 assert(std::adjacent_find(forward_iterator<const int*>(ia+3),
51 forward_iterator<const int*>(ia + sa),
52 std::equal_to<int>()) ==
53 forward_iterator<const int*>(ia+sa));
54
55 #if TEST_STD_VER > 17
56 static_assert(test_constexpr());
57 #endif
58 }
59